728 NT8D15 E and M Trunkcard
•Ability to enable and disable individual ports or the entire card under
software control
•Provides outpulsing on the card. Make break ratios are defined in
software and down loaded at power upand by software commands.
•Provides indication of card status from self-test diagnostics on faceplate
Light Emitting Diode (LED)
•Supports loopback of PCM signals to DS30X for diagnostic purposes
•Card ID provided for auto configuration and determining serial number
and firmware level of card
•Software controlled terminating impedance (600, 900, or 1200 ohm)
two and four-wire modes
•Allows trunk type to be configured on a per port basis in software
•Software controlled 600 ohm balance impedance is provided.
•isolation of foreign potentials from transmission and signaling circuit
•Software control of A/mu law mode
•Software control of digit collection
Card interfaces
The E and M Trunkcard passes voice and signaling data over DS-30X
loops and maintenance data over the card LAN link.
The E and M Trunkcard contains four identical and independently
configurable trunk interface units (also referred to as circuits). Each
unit provides impedance matching and a balance network in a signal
transformer/analog hybrid circuit. Also provided are relays for placing
outgoing call signaling onto the trunk. Signal detection circuits monitor
incoming call signaling. A CODEC performs A/D and D/A conversion of
trunk analog voiceband signals to digital PCM signals.
The four units on the card can operate in the A-Law or the µ-Law
companding mode. The mode is selected by making service change
entries. Each unit can be independently configured for 2-wire E and M,
4-wire E and M, and paging trunk types. The trunk type is selected by
service change entries and jumper strap settings. All units on the card
can perform the following features:
•convert transmission signals from analog-to-digital and digital-to-analog
•provide outpulsing on the card: make/break ratios are defined in
software and downloaded at power-up and by software command
•provide 600-ohms balance and termination impedance (2-wire
configuration)
•provide 600-ohms termination impedance (4-wire configuration)
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright© 2003-2008, Nor tel Networks
.